15. Rigid boundary channels carrying sediment free water, should consider: a) The velocity of should not be slow for silting b) The velocity of should not be high for scouring c) The velocity is determined from Mannings formula 16. The conveyance of a channel section increases with: a) decrease in the wetted perimeter. b) increase in the wetted perimeter. c) does not depend on the wetter perimeter. 17. Flow in most sanitary and storm sewers can be treated as: a) Hydraulic flow b) Open channel flow 18. For Muskingum method, two constants values are given: Co = 0.6, Cı= 0.2, then which of the following will be a possible value of C2. a) 0.2 b) 0.22 c) 0.25

An asphalt pavement drains into a rectangular concrete channel. The catchment surface has an average slope of 1.0%, and the distance from the catchment boundary to the drain is 30m. The drainage channel is 60 m long, 20 cm wide, 25 cm deep, and has a slope of 0.6%. For an effective rainfall rate of 50 mm/h, the flow rate in the channel is estimated to be 0.02 m³/s. Estimate the time of concentration of the catchment.

Determine the settling and horizontal velocity of grit chamber to remove grit particle with size of 0.2mın from wastewater if average area of grit chamber =0.058m². Determine the required length of chamber and the depth at average and minimum flow and dimension the weir plate if the width of control flume 0.2m? (Qmin=0.2Qavg, Qmax=4Qavg) 17

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